I suspect the chance of boiling brake fluid may not be as rare as imagined on vehicles that spend some months or longer laid up, as many classic cars seem to..? ,Perhaps more likely in regions where the climate is such that it encourages corrosion and possible seizing of brake cylinders, or pads sticking to a mix of pins and or calliper castings causing partial or intermittent seizure, and dependant on severity can boil DOT 5 or other brake fluids to create a pedal to the floor situation when brakes are first applied..... After which pump the pedal rapidly in an attempt to slow things down..
